package com.servlettest.servlets;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class GetHeadInfoServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	/**
	 * The doGet method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out
				.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		printContent(request, out);
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	@SuppressWarnings("rawtypes")
	public void printContent(HttpServletRequest request, PrintWriter out) {
		Enumeration e = request.getHeaderNames();
		String name = "";
		out.println("<H2>HEAD INFO<br>");
		out.println("<table border='1'>");
		while (e.hasMoreElements()) {
			name = (String) e.nextElement();
			out.println("<tr><td>" + name + ":</td><td>"
					+ request.getHeader(name) + "</td></tr>");
		}
		out.println("</table>");
	}

	/**
	 * The doPost method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to
	 * post.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request, response);
	}

}
